docs: def _playlist_format_changed(self):
          """ Check if we have new or old format
              and report if format has changed
  
              Format type can change by editing encoding,
              deleting a non-utf-8 station etc.
          """
          new_format = False
          for n in self.stations:
              if n[2] != '':
                  new_format = True
                  break
          if self.new_format == new_format:
              return False
          else:
              return True